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Code Issues Releases Wiki Activity

Removed now obsolete section (see issue #101)

Raymond Hill 2014-07-31 09:56:52 -07:00
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Tricks-and-tips.md

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#### Easy way to find out what other blockers do not block what they should block
Since version 0.2.0.0, when the popup blocker code was added, µBlock decides whether a request should be cancelled during `chrome.webRequest.onBeforeSendHeaders`. Before 0.2.0.0, the cancellation of net requests was done earlier in the pipeline, during `chrome.webRequest.onBeforeRequest`. The change was required because the popup blocker code needs the HTTP referrer header to do its job.
Net requests can be cancelled as effectively using `chrome.webRequest.onBeforeSendHeaders`, so it's not an issue. There is a side effect though, which can actually be quite useful: you can find out what other blockers do not block.
Other blockers typically cancel requests during `chrome.webRequest.onBeforeRequest`, which means by the time µBlock's handler kicks in, many, if not all, net requests have been blocked by the other blocker(s).
So in such case, if you notice µBlock actually still ends up blocking something, it's actually everything the other blocker(s) did **not** block. Thus, µBlock can also be used to find out what other blockers are missing.
Here is an example. ABP with _EasyList_ and _EasyPrivacy_. µBlock shows it blocked one request, thus something was **not** blocked by ABP:
![Did not block](https://raw.githubusercontent.com/gorhill/uBlock/master/doc/img/tips-n-tricks-001.png)
Turns out it's Google Analytics... I really thought _EasyPrivacy_ was blocking completely Google Analytics. How many of you also thought so? ([Found this...](https://adblockplus.org/forum/viewtopic.php?t=22023)).
Once you disable the other blocker(s), µBlock will take over the whole responsibility to block all you want (and this includes Google Analytics with out of the box settings, via [_"Peter Lowe’s Ad server list"_](http://pgl.yoyo.org/as/)):
![Did not block](https://raw.githubusercontent.com/gorhill/uBlock/master/doc/img/tips-n-tricks-002.png)
Note that using µBlock as a tool to find out what other blockers **do not** block works as long as the other blockers completely rely on `chrome.webRequest.onBeforeRequest` to do their job, and not on `chrome.webRequest.onBeforeSendHeaders`.
[I will add whatever relevant here as time go]